remove unused import

Author: Niall Brennan

src/test/java/com/segment/analytics/android/integration/firebase/FirebaseTest.java

@@ -6,7 +6,6 @@
 
 import com.google.firebase.analytics.FirebaseAnalytics;
 import com.segment.analytics.Properties;
-import com.segment.analytics.ValueMap;
 import com.segment.analytics.android.integrations.firebase.FirebaseIntegration;
 import com.segment.analytics.integrations.IdentifyPayload;
 import com.segment.analytics.integrations.Logger;